Merge pull request #135 from pytest-dev/altendky-patch-3

Author: altendky

.github/workflows/ci.yml

@@ -138,17 +138,19 @@ jobs:
       - name: Enable Problem Matchers
         run: |
           echo "::add-matcher::.github/local-problem-matchers.json"
-      - name: Set up ${{ matrix.python.name }} (if CPython)
-        if: ${{ job.container == '' && matrix.python.implementation == 'cpython'}}
+      - name: Set up ${{ matrix.python.name }}
+        if: ${{ job.container == '' }}
         uses: actions/setup-python@v2
         with:
-          python-version: '${{ matrix.python.action }}.0-alpha - ${{ matrix.python.action }}.X'
-          architecture: x64
-      - name: Set up ${{ matrix.python.name }} (if PyPy)
-        if: ${{ job.container == '' && matrix.python.implementation == 'pypy'}}
-        uses: actions/setup-python@v2
-        with:
-          python-version: '${{ matrix.python.action }}'
+          # This allows the matrix to specify just the major.minor version while still
+          # expanding it to get the latest patch version including alpha releases.
+          # This avoids the need to update for each new alpha, beta, release candidate,
+          # and then finally an actual release version.  actions/setup-python doesn't
+          # support this for PyPy presently so we get no help there.
+          # 
+          # CPython -> 3.9.0-alpha - 3.9.X
+          # PyPy    -> pypy-3.7
+          python-version: ${{ fromJSON(format('["{0}", "{1}"]', format('{0}.0-alpha - {0}.X', matrix.python.action), matrix.python.action))[startsWith(matrix.python.action, 'pypy')] }}
           architecture: x64
       - name: Report Python information
         shell: bash